Systems, Linux and Database Notes
GNULinuxClub is a personal collection of practical notes on Linux, Unix, databases, command-line tools and engineering troubleshooting.
The site focuses on useful technical notes: commands, fixes, database issues, migration thinking, operational habits and small engineering lessons that are easy to forget.
Start here
- Linux Troubleshooting — boot, filesystems, permissions, storage and practical fixes.
- Command Line — useful Linux and Unix command notes.
- Database Notes — Oracle, PostgreSQL and database troubleshooting notes.
- Engineering Notes — migration, support and systems-thinking notes.
Recent notes
Recent posts from the technical notes collection.
- Who Thought Banks Would Move from Oracle to PostgreSQL?
- How to Back Up an Oracle Schema with exp and expdp
- Recover or Reinstall the GRUB Bootloader
- Download Files from a Directory with wget
- How to Check Directory Size in Linux Using du
- Shutdown Linux after pre-determined time
Core topics
Linux administration, shell commands, Oracle and PostgreSQL notes, networking basics, filesystem issues, access and permissions, operational cleanup, and engineering notes from real systems work.